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92 lines
2.8 KiB
Go
92 lines
2.8 KiB
Go
//go:build linux
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// +build linux
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/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package conntrack
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import (
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"fmt"
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"github.com/vishvananda/netlink"
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"k8s.io/client-go/util/retry"
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"k8s.io/klog/v2"
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"k8s.io/kubernetes/pkg/proxy/util"
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)
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// Interface for dealing with conntrack
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type Interface interface {
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ListEntries(ipFamily uint8) ([]*netlink.ConntrackFlow, error)
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// ClearEntries deletes conntrack entries for connections of the given IP family,
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// filtered by the given filters.
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ClearEntries(ipFamily uint8, filters ...netlink.CustomConntrackFilter) (int, error)
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}
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// netlinkHandler allows consuming real and mockable implementation for testing.
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type netlinkHandler interface {
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ConntrackTableList(netlink.ConntrackTableType, netlink.InetFamily) ([]*netlink.ConntrackFlow, error)
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ConntrackDeleteFilters(netlink.ConntrackTableType, netlink.InetFamily, ...netlink.CustomConntrackFilter) (uint, error)
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}
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// conntracker implements Interface by using netlink APIs.
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type conntracker struct {
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handler netlinkHandler
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}
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var _ Interface = &conntracker{}
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func New() Interface {
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return newConntracker(&netlink.Handle{})
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}
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func newConntracker(handler netlinkHandler) Interface {
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return &conntracker{handler: handler}
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}
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// ListEntries list all conntrack entries for connections of the given IP family.
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func (ct *conntracker) ListEntries(ipFamily uint8) (entries []*netlink.ConntrackFlow, err error) {
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err = retry.OnError(util.MaxAttemptsEINTR, util.ShouldRetryOnEINTR, func() error {
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entries, err = ct.handler.ConntrackTableList(netlink.ConntrackTable, netlink.InetFamily(ipFamily))
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return err
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})
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return entries, err
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}
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// ClearEntries deletes conntrack entries for connections of the given IP family,
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// filtered by the given filters.
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func (ct *conntracker) ClearEntries(ipFamily uint8, filters ...netlink.CustomConntrackFilter) (int, error) {
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if len(filters) == 0 {
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klog.V(7).InfoS("no conntrack filters provided")
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return 0, nil
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}
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var n uint
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var err error
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err = retry.OnError(util.MaxAttemptsEINTR, util.ShouldRetryOnEINTR, func() error {
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var count uint
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count, err = ct.handler.ConntrackDeleteFilters(netlink.ConntrackTable, netlink.InetFamily(ipFamily), filters...)
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n += count
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return err
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})
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if err != nil {
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return int(n), fmt.Errorf("error deleting conntrack entries, error: %w", err)
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}
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return int(n), nil
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}
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